21-r=3

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Solution for 21-r=3 equation: 


Simplifying
21 + -1r = 3

Solving
21 + -1r = 3

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-21' to each side of the equation.
21 + -21 + -1r = 3 + -21

Combine like terms: 21 + -21 = 0
0 + -1r = 3 + -21
-1r = 3 + -21

Combine like terms: 3 + -21 = -18
-1r = -18

Divide each side by '-1'.
r = 18

Simplifying
r = 18

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